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Could somebody assist me with the command to show the luns mapped to redhat enterprise server 6.1 host. And how do i known the WWNN for the FC HBA attach to the host.
Hard to say, since you don't give any details about the HBA's you're using, what SAN hardware, and what software you're using to talk to the SAN.
The output of ls -l /sys/block/*/device should give you an idea about how each device is connected to the system. But that's a basic Linux command. If you're using multipathing, or any sort of SAN managment software, it's going to be different. Talk to your SAN administrators, HBA and SAN vendors. The driver you got from the HBA/SAN vendor should also have instructions, if you read them.
And how do i known the WWNN for the FC HBA attach to the host.
I'm not sure if this would work but the World Wide numbers for Fibre Channel HBAs usually look like MAC addresses so you might get lucky with an ifconfig command as it's the equivalent of a fibre connected nic. Hardware address = WWN
I've nothing to confirm this with so it may be a load of tosh!
sorry, ifconfig command will not give the WWNN number of a HBA. Augustine, can you give a little more information about your host, kernel-version and distro. I am not aware about redhat enterprise server 6.1
Still, if i take RHEL 5.x series, i can get it from /proc/scsi/qla2xxx/scsi 0 or scsi 1 (in my case qlogic is the HBA vendor).Have a look at those scsi* files. You will get the WWNN and WWPN number.